Will this cart fit through my garage doorway?

At 24 inches wide, it will pass through most standard doors. Measure your opening beforehand to be sure, especially if your shop has narrow entry points.

Does this come with casters or wheels?

Wheel configuration is not specified. Verify what's included before installation, and confirm the cart's weight capacity if you plan to load it heavily.

What kind of finish does the steel have?

Steel construction without a specified coating. You can paint or seal it if you want to protect it from rust in a humid shop environment.